Secondary School (English Medium) (5 to 8) इयत्ता ७ - CBSE Question Bank Solutions

High speed wind can cause cyclone in regions of ______ pressure.

State whether the following statement is True or False:

A very high pressure system, with very high speed wind surrounding it forms a cyclone.

State whether the following statement is True or False:

The coast line of India is not vulnerable to cyclones

How are open drains harmful to human health?

Distinguish between a parasite and a saprotroph.

Plants which synthesise their food themselves are called saprotrophs.

The product of photosynthesis is not a protein.

Solar energy is converted into chemical energy during photosynthesis. 

How will you help your neighbours in case cyclone approaches your village/town?

What planning is required in advance to deal with the situation created by a cyclone?

Take three test-tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO₂?

An image that cannot be obtained on a screen is called ______.

Image formed by a convex ______ is always virtual and smaller in size.

An image formed by a ______ mirror is always of the same size as that of the object.

An image which can be obtained on a screen is called a ______ image.

We can obtain an enlarged and erect image by a convex mirror.

We can obtain a real, enlarged and inverted image by a concave mirror.

A concave mirror always forms a real image.

Match the items given in Column I with one or more items of Column II.

Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.